Improvement in the preparation of photographs for the reception of colors



UNITED STATES,

- GEORGE crawls, or WASHINGTON, DISTRICT OF COLUMBIA."

IMPROVEMENT IN THE PREPARATION OF PHOTOGRAPHS FOR THE RECEPTION 0FCOLORS.

, Specification forming part of Letters Patent No. 176,653, dated April25, 1876; application filed Ss-ple nb r 9, 1875.- p

To all whom it may concern-r Be it known that I, GEORGE G. LEWIS, ofWashington, in the District-of Columbia, have invented certain new anduseful Improve- I ments in Finishing Pictures termed Chromotypes, ofwhich the following is a specification This invention relates to certainimprove ments in finishing the surfaces ofphotographic pictures,its-object being to pro'duceupon the surfaces of the ordinary positivepictures taken directly in the camera a coating which can be finished upin crayons or water-colors with the same facilities as the surfacesoftheordinary positive prints produced from a negative picture, andwhieh willserve, also, as a protecting substance to the thin collodiontilm and thevarious portions of the picture which itsustaiiis. v I

'lhc invention consists in an, improved -n1ethod ofproducing upon thesurlaces of such pictures an adhesive coating of-such nature as toreadily receive the coloringmatter,

and of sufficient strength-to Withstand the rubbing of the crayons andform a protecting coveringto tlie'picture, by applying to the. same acoating of any soluble gum or gelati nous material, .in combination withhoney or other similar -h y groscopic material, and allowing the same.todry, as fully hereinafter described; I

" In carrying out my'invention I take gumarabic, dextrine, 'gelatine, orother similar substance, and combineit with honey, grapesugar,glycerine, or other similar hygroscopic substance. 1 In practice I finda solution of gum-arabic and honey toanswer admirably.

These substances I use in equal proportions, with or without theaddition of water, according to the thickness and strength of the requ'ired coating. I apply the compound to the plate after fixing andwashing, flowing it over the surface until the whole is evenly covered,after which I dry the whole by natural or artificial heat. The surfacethus producedupon the plate will be extremely adhesive, and will havesufficient strength to sustain the coloring matter and the rubbingnecessary to apply the same. The gum forms the ground or base of thecoating or surface, while the honey or'hy groscopic materialett'ectually 'prevents any tendency of the gum to crackor chip 011".

I The-finished pictures formed by inyimprovedprocessl term chromotypes,to dis-v tinguish them from other photographic pictures.

Having thus described my invention, what I claim, and cut, is-- Y Theprocess herein described of preparing -the surfaces of photographicpictures for the reception of coloring material by applying to thesame'a coating of gummy or gelatinous substance combined with honey orother hygroscopic material, substantiallyas set forth. In testimony thatI claim the foregoingI have hereunto set my hand in the presence of thesubscribing witnesses.

Witnesses:

'JAMEs L. NORRIS, J 0s. L. OooMBs.

GEO.- G- LEWIS.

desire to secure by Letterslat- 4

